package leetcode.topinterviewquestions;

public class Problem_0171_ExcelSheetColumnNumber {

    // 这道题反过来也要会写
    public static int titleToNumber(String s) {
        char[] str = s.toCharArray();
        int ans = 0;
        for (int i = 0; i < str.length; i++) {
            ans = ans * 26 + (str[i] - 'A') + 1;
        }
        return ans;
    }

}
